I have scanned some negatives using VueScan (mostly black and white thus far) and the
results are far superior to any software I've been using. With the first
few scans (just after turning on the Epson 1200U scanner), there was hardly any
posterization with VueScan. After about an hour after the scanner was turned
on, however, the posterization problem began creeping back - perhaps a failing chip in
the scanner as it heats up. But the VueScan product seems far superior
to the Epson twain and SilverFast with all things being equal with the scanner cold.
Jim Sims
Richard Wolfson wrote:
> This just in from Ed Hamrick. I learn something every day, and often
> more than once. It's really kind of Ed to take the time to explain all
> this. Thanks Ed.
>
> Richard Wolfson
> rwolfson at LyricDesign.com
>
> > -----Original Message-----
> > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]
> > Sent: Thursday, October 26, 2000 4:42 PM
> > To: [EMAIL PROTECTED]
> > Subject: Re: VueScan & Epson 1200S success & question.
> >
> >
> > In a message dated 10/26/2000 7:19:20 AM EST,
> > [EMAIL PROTECTED] writes:
> >
> > > And a suggestion to Ed: the option of saving 48 bit tiffs should be
> > > DISABLED when VueScan can't get more than 8 bits from the scanner.
> > > Otherwise the software serves as an "unidicted co-conspirator," to
> > > borrow an old Watergate term. (Maybe Nixon is alive and
> > consulting to
> > > Epson?)
> >
> > It's actually quite useful to save in 48-bit mode. The original
> > data from the scanner is 8-bit data, but then it gets mapped
> > back to 12-bit resolution and all film processing is done in
> > 16-bit precision.
> >
> > In addition, the 12-bit to 8-bit mapping sent to the scanner
> > uses a linear segment in the darkest part, so more detail
> > is pulled from the dark parts of slides (or bright parts of
> > negatives) than you'd otherwise expect.
> >
> > Lastly, negative film processing is very non-linear, so
> > mapping the 8-bit data to 16-bit data is useful.
> >
> > In summary, it's useful to save the final processed image
> > in 48-bit format even though the scanner only transfers
> > 8-bit data.
> >
> > Regards,
> > Ed Hamrick
>
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